py27-html-docs: Update to 2.7.17

Changes:
2.7.17
======
Documentation
-------------
- bpo-37487: Fix PyList_GetItem index description to include 0.
- bpo-37149: Replace the dead link to the Tkinter 8.5 reference by John
  Shipman, New Mexico Tech, with a link to the archive.org copy.
- bpo-35126: Improve the examples in the "How do I convert a number to
  string?" question of the "Programming" section of the FAQ.  Contributed by
  St辿phane Wirtel.
- bpo-35605: Fix documentation build for sphinx<1.6.  Patch by Anthony
  Sottile.
- bpo-35564: Explicitly set master_doc variable in conf.py for compliance
  with Sphinx 2.0
- bpo-33832: Add glossary entry for 'magic method'.

(leot)